Typewriting machine



C. B. CORCORAN. TYPEWRITING MACHINE.

' APPHCATION FILED OCT- 16, I9I9. 1,433,702.,

Patented Oct. 31, 1922,

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Application filed October 19, 1919. .Serial lie. 1:

To all whom it may concern:

Be it known that I, Corns-mus B. Con- CORAN, a citizen of the United States, residing in borough of the Bronx, in the county of the Bronx, city and State of New York, have invented certain new and useful improvements in Typewritinr: Machines, of which the "following is a specification.

This invention relates to typewriting machines, and more especially to thesignaling mechanism which is used for indicatingthe approach to the end of a line of writing. The

invention is herein disclosed as applied to an Underwood standard .typewriting machine, one form of which is disclosed in the patent to Pfunder and Cook, llo. 853,562, of May 141, 1907, and disclosed in the (Bo-pending application of Helmond, No. 279,081, filed February 25, 1919.

Such line-end signaling mechanism usually includes a bell for notifying the typist that the end of the line has almost been. reached, and where typewriting machines are used in noisy places, or where a typist is trying to write very fast, extraordinarily large bells have frequently been used to enable the typist to be forcibly reminded that the end of the line is approaching. It has been found that such very large bells are unnecessary it instead thereof two bells of smaller or a usual size are employed, especially it: such bells are of different and discordant tones. Finch two bells maybe run by a single clapper mechanism, which may be for the most part identical with that hitherto in use, or that disclosed in said application No. 279,081.

By thus using two bells, preferably of discordant tones, the loud noise incident to the use of a louder bell, with its distractin effect on other typists, is avoided, while at the same time the efficiency of the signal is" in no way diminished and may be actually increased.

Other features and advantages will hereinafter appear. I

In the accompanying: drawings,

Figure l is a fragmentary skeleton per-- spectiveview of an Underwood typewriting machine embodying many or" the features shown in said application No. 279,081.

Figure 2 is a sectional plan view of the two bells and the clapper.

another. form of which is In the Underwood typewriting machine, the carriage 1 comprises a laten 2, which is revoluble' therein and travels with the carriage, so that types 3 of the usual form print against the front of it at the letter-space noted by the usual pointer mounted upon the usual carri l. ll hen the type writer (-arria e pproaches the end of the r line which the t3 1 hasdetermined is of the usual tappet 5 rides upon the usual coin 6. which latter is shirt the proper length able with the usual left-hand .nstop Y, with the result that the tappet 5 swings he cam 6 and causes 7' wardly a depending arm 8, which maybe of the form shown in said patent or applica tlon.

The swinging forward of the arm 8 causes a one-way tappet 9, pivotally attached to the lower end thereof, to sweep forwardly over cam 10 of a bell-ringing: arm 11, with the result that the tappet t depresses the front end of the arm 11. swinging it around its pivot 12, and then releases the arm: so that the hammer 1.8 the rear end thereof is first raised and at the releasing ot the arm drops upon a hell 14. This rings the bell and notifies the typist that the carriage 1 has almost reached the limit of its travel.

In order to enable the hammer 13 to operate eificiently, the rear end of the arm 11 formed a resilient wire 15, which supports the hammer '13 within the periphery of the bell 14: and enables the bell be easily adjusted by bending: the wire According to tending upwardly from the bottom bar 18 of the frame, has adjacent thereto a second bell 19 carriedbv upper extension 20 of the bolt 16. The bell 14 may be held against the lug l? by a shoulder 21 on the bolt 16, and the bell 19 may be spaced from the hell 4: by suitabl positioned second shouldei on the extension 20 of he bolt, and be held in position by a nut screwed down outside the bell 19 to force it against the shoulder tightening of the nut screws the bolt 16 down into threaded opening .2 1 in the lug 17. thus tightening both bells in place with. their bases near each 15 swingclear" 7 there is preferably provided a second hamthe cam to swin forq mer 25, so arranged that the hammers l3 and 25 strike the bells substantialiy simultaneously. I

The'hammers may be formed as a single clapper elongated transversely of the wire 15 and having twoheads, onto the junction of which the wire 15 is twisted to enable it to hold the hammers. The hammers 13 and 25 of the duplex clapper, as clearly appears from Figures 1 and 2, do not engage the edges of the bells 14 and 19, but extend within the bells far enough to engage them squarely at some distance from their edges.

lthas been found that two bells having tones'three steps apart from a considerable improvement over a single bell, but that if the two bells, instead of being thus tuned to harmony, are tuned to discordant tones, they are more efiective.

It is diflicut to arrange a clapper so as to cause it to engage two or more bells at exactly the sametime, and it is even more difiicult to preserve an arrangement of parts in which a clapper will engage a plurality of bells at exactly the same time. In the use of a single clapper with a plurality of bells, the parts, due to the impact ofthe clapper on the bells, will soon be thrown I out of alignment so that the clapper will engage one of the bells before the other, and if the clapper is of usual construction it may'ring only the hell with which it first engages. In the use of a duplex clapper, such as is herein-before described, however, the engagement of the clapper with each of the bells is assured, since, if one of the hammers of the duplex clapper engages its bell before the other, the clapper will tilt in a plane transverse to the plane of movement of the clapper as a whole, so as to cause the other hammer of the clapper to engage its respective bell only very slightly after the engagement of the first hammer with its bell. This action of the clapper is facilitated by the fact that the wire 15 is arranged in a plane intermediate between v the planes of movement of the hammers 13 and 25, and by the further fact that the wire is resilient so that the clapper may readily tilt to the degree required to bring both of the hammers intoengagement with their respective bells.

It will be noted that the two bells thus mounted interfere with no other mechanism in the usual Underwood standard typewriting machine, and that they in nowise interfere with the operation of the usual type key-locking bar 26 by thearm' 8.

It will also be noted that the degree of loudness of the bells may be below the nor- "mal which would ordinarily be required for Thus, in ordif-nary working conditions the degree of loudgiven working conditions.

ness "of the signal might be below that of the bell of usual size, the bells of the pair being o1 less than the usual size. In this way an effective signal would bevgiven with a. minimum of noise.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others. Having thus described my invention I claim:

1. In a typewriting machine, the combination with a traveling carriage and a platen, of a. machine frame, a bell, a bolt mounted on said frame to hold the bell, a second bell of different tone supported by the bolt, said bells having their bases adjacentito each other, a single clapper for the'twobells,

means made eii ective by the carriage travel for operating the clapper to ring said bells, and connections between the clapper and; its operatingmeans constructed to enable the clapperto tilt in a plane'transverse to'the movement of the clapper as a'whole to' assure that both of the bells will be rung upon operation of the clapper, said clapper being elongated transversely of the direction of its movement so asto' engage the bells at points spaced by substantial distances from the edges of the bells and from the plane of movement of the connections at their juncture with the clapper.

2. In a typewriting machine, the combination with a traveling carriage and a platen, of a machine 'iframe, two bells 'upon the frame, a single duplex clapper comprising hammers arranged for striking engagement with the respective bells, means made efiective by the carriage travel for operating the clapper to ring the bells, andwa connection between the clapper and its operating means, said connection being resilient to enable the clapper to tilt readily to the degree required to bring both: of thewhammers into engagement with their respective bells.

In a typewriting machine, the combination with a traveling carriage and a platen, of a machine frame, two bells :upon the frame, a singleduplexclappcr comprising hammes arranged for striking engagement with the respective bells, means made-effective by the carriage travel for operating the clapper to. ring thebells, anda -connec- CORNELIUS B; CORGORAN.

Witnesses: V

FRED A. GROSE, CATHERINE A. NEWELL. 

